Method of making storage tank for liquids comprised of prefabricated and prepainted components

ABSTRACT

A storage tank for liquids, including a vertically extending pedestal comprised of at least one cylindrical section prefabricated and prepainted in a shop, means securing said cylindrical section in operative position, and an enlarged tank, preassembled and prepainted outside the shop, secured on top of the preassembled pedestal, said preassembled tank and pedestal having the necessary accessory devices thereon, the preassembled and prepainted tank and pedestal being considerably more economical than conventional tank construction wherein the tank and pedestal are completely built on the site and the pedestal and tank are painted after complete assembly thereof.

United States Patent [1 1 [1 11 3,805,369 Harper Apr. 23, 1974 [54]METHOD OF MAKING STORAGE TANK 3,219,224 11/1965 Anderson 220/1 B FLIQUIDS COMPRISED 0 3,235,956 2/1966 Heathcote et al. 29/429PREFABRICATED AND PREPAINTED COMPONENTS Inventor: George C. Harper,Coraopolis, Pa.

Pittsburgh-Des Moines Steel Company, Pittsburgh, Pa.

Filed: Mar. 17, 1972 Appl. No.: 235,746

Assigneez.

References Cited UNITED STATES PATENTS 6/1946 Brown 29/458X 2/1961 Brady29/453 X Primary ExaminerCharlie T. Moon Attorney, Agent, orFirm-Shoemaker and Mattare [5 7] ABSTRACT A storage tank for liquids,including a vertically extending pedestal comprised of at least onecylindrical section prefabricated and prepainted in a shop, meanssecuring said cylindrical section in operative position, and an enlargedtank, preassembled and prepainted outside the shop, secured on top ofthe preassembled pedestal, said preassembled tank and pedestal havingthe necessary accessory devices thereon, the preassembled and prepaintedtank and pedestal being considerably more economical than conventionaltank construction wherein the tank and pedestal are completely built onthe site and the pedestal and tank are painted after complete assemblythereof.

13 Claims, 16 Drawing Figures BACKGROUND OF THE INVENTION This inventionrelates to a storage tank for liquids, and more particularly, relates tolarge elevated storage tanks for water, wherein an enlarged tank issupported in elevated position on top of a vertically extending columnor pedestal.

In conventional elevated storage tank constructions, which include anenlarged tank supported on top of a vertically extending pedestal, thetank and pedestal are constructed in situ with the individual platescomprising the pedestal and tank, welded or otherwise suitably securedtogether progressively from the ground up, and after the pedestal andtank are completely constructed, they are then cleaned and painted. Insome instances, the tank is constructed on the ground and then hoistedinto position on top of the pedestal. In any event, in prior artelevated tank constructions, considerable labor and time are spent byworkmen at dangerous heights from the ground. Consequently, the work inconstructing conventional elevated storage tanks is dangerous and,because of the necessity of performing substantial work at largeheights, the time required to construct a tank and the cost of the tankare quite large.

With the present invention, the pedestal or vertically extending supportfor the tank is completely constructed in a shop facility, includingfabrication, cleaning and painting of the pedestal, and the pedestal isthen shipped to the site at which the elevated storage tank is to beconstructed. The enlarged tank is completely constructed, includingcleaning and painting thereof, on the ground and the pedestal is thenplaced in operative position on a preformed concrete foundation. Thepreconstructed and prepainted tank is then lifted on top of the pedestaland secured thereto. All accessory devices, such as ladders, headerpipes, flanges, manholes and the like, are constructed in the pedestaland tank before the pedestal and tank are assembled on the foundationand, as a consequence, all that is required to complete the tank at thesite is to secure the pedestal to the foundation and to secure the tankon the pedestal. The accessory devices, such as ladders, header pipesand the like, are simply joined together at the junction betweenpedestal sections and between the pedestal and tank. Very little work isthus required to be performed at any substantial height above the groundand the tank can, accordingly, be constructed with considerably lessdanger to the workmen and with a substantial savings in time and costinvolved in constructing the tank as compared with conventional tankconstructions.

OBJECTS OF THE INVENTION It is an object of this invention to provide astorage tank for liquids which requires considerably less time andeffort to construct and which is substantially more economical thanconventional storage tanks for liquids.

Another object of this invention is to provide a storage tank forliquids comprising a vertically extending pedestal and an enlarged tanksupported on the top thereof, said pedestal and tank beingpreconstructed and prepainted, and then assembled together.

A further object of this invention is to provide an elevated storagetank for liquids, comprising a vertically extending pedestal and anenlarged tank supported on the upper end thereof, said pedestal beingconstructed and painted in a shop facility and transported to the siteof said tank, and said enlarged tank being constructed and painted onthe ground and then lifted onto the top of said pedestal and securedthereto.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in elevation of astorage tank in accordance with the present invention.

FIG. 2 is a sectional view of the tank shown in FIG. 1.

FIG. 3 is a view in elevation of a top section of the pedestal,temporarily bolted in position on a foundation.

FIG. 4 is a view similar to FIG. 3 showing the conical portion of thetank being constructed.

FIG. 5 is a view similar to FIG. 4 showing the cylindrical portion ofthe tank being constructed.

FIG. 6 is a view similar to FIG. 5 showing the roof being assembled tothe tank and the tank being painted.

FIG. 7 is a view in elevation with the tank removed from the foundationand supported on suitable blocks and with a first section of thepedestal being placed onto the foundation.

FIG. 8 is a view in elevation of the pedestal bolted in position on thefoundation.

FIG. 9 is a view in elevation showing the manner in which two pedestalsections are positioned one upon the other.

FIG. 10 is a view in elevation showing the manner in which the tank islifted onto the top of the pedestal.

FIG. 11 is a view in section taken along line 11-11 in FIG. 10.

FIG. 12 is a view similar to FIG. 5 of a modified means of constructingthe tank, wherein the tank is constructed in two portions temporarilysecured together.

FIG. 13 is a view in elevation similar to FIG. 12 of a completed tanktemporarily joined at a seam through the middle thereof and with saidtank being painted.

FIG. 14 is a view similar to FIG. 7.

FIG. 15 is a view illustrating the manner in which the modified methodof tank construction is accomplished and wherein one-half of theenlarged tank is positioned on top of the pedestal.

FIG. 16 is a view similar to FIG. 10 showing the second half of theenlarged tank positioned on top of the pedestal and with the seambetween the halves of the enlarged tank being painted.

DETAILED DESCRIPTION OF THE INVENTION In the drawings, wherein likereference numerals indicate like parts throughout the several views, anelevated storage tank for liquids is indicated generally at T in FIG. 1and comprises an elongate, cylindrical, vertically extending pedestal 20and an enlarged tank 30 supported on top of the pedestal 20.

The pedestal 20 comprises a plurality of plates P welded or otherwisesuitably secured together at their adjacent edges as at W. An annularbase plate or flange 21 is suitably secured to the lower end of thepedestal 20, as by welding or the like, and a plurality of bolts B, suchas anchor bolts, extend through the base plate or flange 21 and througha suitable grout G into a concrete foundation F, provided on asupporting surface S, such as the ground. Suitable means, such as amanhole M or'the like, is in the pedestal adjacent the lower end thereoffor gaining access to the interior of the pedestal.

Depending upon the size and height of the tank and pedestal, more thanone pedestal section joined in endto-end superposed relationship may beprovided as shown in FIG. 2, wherein two substantially identicalpedestal sections a and 20b are joined in end-to-end relationship bymeans of bolts B extended through inturned flanges 22 on the adjacentends of the pedestal sections 20a and 20b. Each of the pedestal sections20a and 20b has necessary accessory devices therein, such as ladder Land header pipe H, with each pedestal section carrying a respectiveportion of the ladder L and header pipe H. When the pedestal sections20a and 20b are joined together, as in FIG. 2, the adjacent ends of theladder L and header pipe H are in alignment and the adjacent ends of theheader pipe H are joined together through a suitable connection, such asa Dresser connection D or the like, to allow for temperature movementand any slight makeup required to allow for any variation in the lengthsof the header pipes H in adjacent sections.

The tank includes a top section 31 of the pedestal, a conical section 32of the tank, a cylindrical section 33 of the tank and a roof R on thetank. The top section 31 of the pedestal has a flange 34 on the lowerend thereof, which is bolted to a flange 35 on the upper end of pedestalsection 20b, by means of a plurality of bolts B. An annular stiffeningring 36 is welded or otherwise suitably secured to the upper end of toppedestal section 31 and a concavo-convex dishplate 37, defining thebottom of the tank 30, is welded or otherwise suitably secured to thetop of stiffening ring 36. The annular peripheral edge 38 of dishplate37 extends upwardly and outwardly a relatively short distance beyond theupper end of top pedestal section 31 and annular stiffening ring 36, andthe center portion of dishplate 37 extends downwardly a short distancewithin the upper end of top pedestal section 31. A platform or the like39 is welded or otherwise suitably secured inside the top pedestalsection 31 adjacent the lower end thereof and a ladder L extendsupwardly therefrom through the dishplate 37 to the interior of the tank.A suitable access means, such as a manhole M or the like, is provided inthe side of top pedestal section 31 adjacent the upper end thereof and asecond access means, such as a manhole M or the like, is in thedishplate 37 to provide access from the interior of pedestal 20 to theinterior of the tank 30. A short section of header pipe H is securedcentrally in the dishplate 37 and has a suitable coupling means D on thelower end thereof for coupling the adjacent sections of header pipe I-Itogether in a manner to allow relative movement therebetween tocompensate for temperature changes and to compensate for variations inthe length of the header pipes in adjacent sections.

The conical section 32 of the tank extends upwardly and outwardly fromthe upper edge of the portion 38 of the dishplate 37 at the upper end oftop pedestal section 31. The conical section 32 of the tank is comprisedof a plurality of suitably shaped plates P, welded or otherwise suitablysecured together at their adjacent edges. A short section of ladder Lextends from adjacent the manhole M along the slope of the conicalportion 32 to the upper edge thereof. An annular stiffening ring 40,similar to stiffening ring 36, is welded or otherwise suitably securedto the upper edge of the conical section 32.

The cylindrical section 33 of the tank 30 is comprised of a plurality ofsuitably shaped plates P, welded or otherwise suitably secured togetheralong their adjacent edges, and the cylindrical section is welded orotherwise suitably secured at its lower end to the top of the stiffeningring 40. A section of ladder L extends from the bottom of thecylindrical section to the top thereof and in alignment with the sectionof ladder L in the conical section of the tank. A roof R is welded orotherwise suitably secured about its peripheral marginal edge portion tothe top edge of cylindrical section 33 and a manhole M or other suitableaccess means is provided therethrough adjacent the upper end of ladder Lto provide ingress and egress means to and from the tank. A suitablevent V is provided at the highest portion of roof R for venting gasestherefrom and a suitable overflow opening 0 is in the cylindricalportion 33 adjacenk the upper end thereof.

As seen in FIG 11, the entire pedestal and tank are covered with a layerof paint 41 to increase the durability and longevity of the pedestal andtank and to enhance the appearance of the tank.

The method of constructing the tank is depicted in FIGS. 3 through 10.In constructing the tank, the various components, such as the plates P,flanges, stiffening rings, header pipes, ladders and the like, arefabricated in a shop facility, including rolling of the pedestal andcylinder tank plates, pressing of the tank conical plates, rolling ofthe stiffener rings, burning and drilling of the various flanges andbase plates, and blast cleaning and painting of the various parts.

The pedestal 20, or if appropriate, pedestal sections 20a and 20b, arethen fabricated in the shop'facility, including fitting and welding ofthe cylindrical pedestal plates together; fitting and welding of flangesand base plates thereon; fitting and welding of the accessory items suchas ladders, pipe headers, insulation if required, manholes, platformsand the like therein; and blast cleaning and painting, including boththe prime and final coats of paint. The top section 31 of the pedestalis also fabricated in the shop facility, including fitting and weldingof the cylindrical plates together; fitting and welding together offlanges, stiffener rings, the dishplate, header pipe, ladders andmanholes and the like therein; and blast cleaning and painting,including both the prime and final coats of paint. The pedestal,including pedestal sections 20a and 20b if more than one pedestalsection is to be used, and the top pedestal section 31 are then shippedto the erection site of the storage tank.

At the erection site of the tank, the top section 31 of the pedestal isset on the concrete foundation F, which has been previously constructed,and is temporarily bolted thereto, as seen in FIG. 3. The plates P inthe conical portion 32 of the tank are then fitted and welded to the topof the annular edge 38 of the dishplate 37 on the top section 31 of thepedestal, as seen in FIG. 4. Stiffener ring 40 is then welded to the topof the conical section 32 and the plates in the cylindrical portion 33of the tank are thenfitted and welded, as

seen in FIG. 5. The roof R of the tank is then fitted and welded to thetop of the cylindrical section 33 and the accessory items, such as theladder L, vent V, overflow O and manhole M, are then installed in thetank. The erection crew then leaves the job site and a paintingsubcontractor cleans and paints the top section of the pedestal and theconical and cylindrical portions and the roof of the tank.

After the tank and pedestal top section are painted, the paintingsubcontractor leaves the job site, and a minimal erection crew thenreturns to the job site to erect the tank. The tank 30 and top sectionof the pedestal are removed with a crane C from the foundation andplaced on supporting cribbing blocks 42 nearby, as seen in FIG. 7. Thepedestal is then set on the foundation with the crane C and fastenedthereto by the anchor bolts B. If the pedestal is to include more thanone section, the first section 20a is set on the foundation and boltedthereto, as seen in FIGS. 7 and 8. As seen in FIG. 9, the second sectionof pedestal 20b is then lifted with the crane G into position on top ofthe first section 20a and bolted thereto by means of bolts B extendingthrough the flanges at the adjacent ends of the pedestal sections 20aand 20b. The tank is then lifted from the cribbing blocks 42 and set ontop of the pedestal and bolted thereto by means of bolts B extendingthrough the flanges 34 and 35. The header pipes H in each of thesections 20a and 20b and in the pedestal section 31 are then boltedtogether at adjacent ends through suitable connecting means, such asDresser connection D or a similar connection, to allow for temperaturechanges and any variation in the length of the header pipes in adjacentsections. If insulation of the piping is required, because of theclimate or other conditions existing at the tank location, it is alsoinstalled at this time. The tank is then filled with water to test forleaks and the like and, if the tank is to be used for potable water, thetank is sterilized.

A slightly modified construction method is depicted in FIGS. 12 through16, wherein the tank 30 is constructed of two substantially identicalhalves 30a and 30b, temporarily joined together along a seam S, witheach half of the tank being lifted independently onto the top of thepedestal and secured thereto, both halves then being permanently weldedtogether along the seam S. This construction method is used when verylarge tanks are required, and substantially reduces the size and weightof the components required to be lifted and handled by the crane C. InFIG. 12, one half 30a of the tank is already constructed on thefoundation F and the cylindrical portion of the half 30b is in theprocess of being constructed. The halves 30a and 30b are temporarilywelded together along seam S. In FIG. 13, the tank 30 is completelyconstructed and is being painted. The area of the tank at the seam Sneed not be painted at this stage of construction, since the seam willneed to be painted at the completion of tank construction. In FIG. 14,the tank 30 has been lifted off the foundation and placed on cribbingblocks or other suitable support means 42 and the pedestal 20 is boltedon the foundation. The temporary seam S between the tank halves 30a and30b is then cut and tank half 30a is set on top of the pedestal 20 andbolted thereto, as seen in FIG. 15. Tank half 30b is then set on top ofthe pedestal and bolted thereto and the tank halves 30a and 30b arepermanently welded together at the seam S and the seam is cleaned andpainted, as seen in FIG.

16. The accessory items and the like are then installed as before. Theconstruction of the tank is the same as previously described in allother respects.

Accordingly, an exceptionally simple and economical tank construction isrealized with the present invention and the danger and time and expenseinvolved in the usual construction of storage tanks is substantiallyreduced, since the pedestal and tank of the present invention arecomprised of prefabricated and prepainted subassemblies, which are thensimply placed in position and bolted or otherwise suitably securedtogether at the site of the tank, thus eliminating the substantial workrequired at large heights above the ground.

By way of specific example, a typical storage tank constructed inaccordance with the present invention would comprise a pedestal having adiameter of approximately l0 feet and a height or length ofapproximately 64 feet from the foundation to the top of section 38. Thetank 30 would have a height of slightly over 23 feet and the overallheight of the tank and pedestal would be slightly over 87 feet. The tankwould have a diameter of approximately 30 feet and a net capacity ofapproximately 100,000 gallons.

As this invention may be embodied in several forms without departingfrom the spirit or essential characteristics thereof, the presentembodiment is therefore illustrative and not restrictive, since thescope of the invention is defined by the appended claims rather than bythe description preceding them, and all changes that fall within themetes and bounds of the claims or that form their functional as well asconjointly cooperative equivalents, are therefore intended to beembraced by those claims.

I claim:

1. The method of making and constructing a large storage tank forliquids comprising making a cylindrical pedestal in a shop andthereafter painting same in the shop, moving said cylindrical pedestalfrom the shop to an outside location, making and painting an enlargedtank outside the shop, placing the pedestal on a previously preparedplace for supporting the pedestal in a vertical position, placing theenlarged tank on the pedestal and securing the enlarged tank to thepedestal, the completely assembled tank and pedestal lessening the timeand expense involved in conventional tank construction wherein the tankand pedestal are completely assembled on-site and painted after completeassembly of the tank and pedestal.

2. The method as in claim 1, wherein the previously prepared placecomprises a concrete foundation and said tank is made and painted on thefoundation and then set aside onto suitable support means, said pedestalthen being placed on and secured to the foundation.

3. The method as in claim 2, wherein a prefabricated and prepainted topsection of the pedestal is temporarily secured to the foudation and thetank is then made on top of the top section of the pedestal.

4. The method as in claim 3, including forming the top section of thepedestal with an. upwardly and outwardly flared section at the topthereof, fitting and welding of plates in a conical section of the tankto the upwardly and outwardly flared section, fitting and welding ofplates in a cylindrical section of the tank to the top of the conicalsection, fitting and welding of a roof to the top of the cylindricalsection, and cleaning and painting of the top section of the pedestal,the conical and cylindrical sections and the roof of the tank.

5. The method as in claim 4, including making the pedestal in twosections, one of said sections being set on and secured to thefoundation, and the other of said pedestal sections then being set onand bolted to the top of the first section.

6. The method as in claim 4, including removing the tank from thesupport means and then setting the tank on top of the pedestal andbolting it thereto.

7. The method as in claim 6, including providing each section of thepedestal with a corresponding length of header pipe and ladder therein,the header pipes and ladders in adjacent sections being in alignmentwith one another.

8. The method as in claim 7, including securing ends of the header pipesin adjacent pedestal sections together through a coupling allowingrelative movement therebetween to compensate for temperature changes andvariations in the length of the header pipe sections.

9. The method as in claim 8, including making the tank in twosubstantially identical halves, and temporarily securing the halvestogether along a temporary seam, and then setting said tank aside ontothe support means.

10. The method as in claim 9, including setting the pedestal on thefoundation and securing it thereto, breaking the temporary seam of thetank, and individually setting each half of the tank onto the pedestaland securing it thereto, the halve then being permanently weldedtogether at the seam, and the seam being cleaned and painted.

l l. The method of making and constructing a storage tank for liquidscomprising the steps of fabricating the various components of the tankin a shop facility, including rolling of column and cylinder tankplates, pressing of tank cone plates, rolling of stiffener rings,burning and drilling of various flanges and base plates, and blastcleaning and painting of the various components; construction of apedestal for the tank including fitting and welding together of thecylindrical plates, fitting and welding together of the flanges and baseplates thereon, fitting and welding of accessory items such as ladders,pipe headers, manholes, platforms and the like thereon, and blastcleaning and painting of said pedestal; constructing a top section ofthe pedestal, including fitting and welding together of cylindricalplates, fitting and welding together of flanges, stiffener 8 rings, anda dishplate, fitting and welding of accessory devices such as manholes,ladders and header pipes and the like to said top section of pedestal,and blast cleaning and painting of said top section of pedestal;shipping of the pedestal and top section of pedestal to an erection sitefor the storage tank; constructing a tank on a previously constructedconcrete foundation, including setting the top section of pedestal onthe foundation and temporarily bolting the same thereto, fitting andwelding of plates in a conical portion of the tank to the top of the toppedestal section, fitting and welding plates in a cylindrical portion ofthe tank to the top of the conical portion, fitting and welding a roofto the top of the cylindrical portion of the tank, and installingaccessory items in the tank, and cleaning and painting the top sectionof the pedestal, the conical and cylindrical portions and the roof ofthe tank; removing the constructed tank from the foundation tosupporting cribbing blocks nearby, setting the pedestal on thefoundation and securing same thereto by anchor bolts, lifting the tankfrom the supporting blocks and setting the same on top of the pedestaland bolting same thereto, connecting the header pipes in adjacentsections of pedestal and tank by means of a Dresser connection to allowfor temperature changes and to compensate for variations in the lengthof header pipe sections, and filling the tank with water and, if thetank is to be used for potable water, sterilizing the tank.

12. The method as in claim 11, wherein the pedestal is made in twosubstantially identical sections, and including the steps of placing afirst section on the foundation and securing it thereto and then placingthe second section of the pedestal on top of the first section andbolting it thereto.

13. The method as in claim 12, wherein the tank is made in twosubstantially identical halves and including the steps of making saidtank on the foundation and securing the two halves of the tank togetheralong a temporary seam, painting said tank, removing said tank from thefoundation to supporting cribbing blocks nearby, placing and securingthe pedestal on the foundation, breaking the temporary seam between thehalves of the tank, lifting each half of the tank individually onto thetop of the pedestal and securing each half thereto, welding the halvesof the tank together along said seam, and cleaning and painting saidseam.

UNITED STATES PATENT oFFTcE CERTIFICATE OF CORRECTWN Patent No. v 3 805369 Dated April 23 y 1974 Inventor( George C Harper It is certified thaterror appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

The present Front Page and the drawing Figures should be cancelled andthe attached sheets substituted therefor, as part of the Letters Patent.v i

Signed and sealed this 13th dayof August 1974.

(SEAL) Attest: V

'McCOY M. GIBSON, JR. C. MARSHALL DANN Attesting Officer Commissioner ofPatents FORM PO-105O (10-69) USCOMM DC 603754359 w u.s. GOVERNMENTPRINTING omc: was oaseas4,

1. The method of making and constructing a large storage tank forliquids comprising making a cylindrical pedestal in a shop andthereafter painting same in the shop, moving said cylindrical pedestalfrom the shop to an outside location, making and painting an enlargedtank outside the shop, placing the pedestal on a previously preparedplace for supporting the pedestal in a vertical position, placing theenlarged tank on the pedestal and securing the enlarged tank to thepedestal, the completely assembled tank and pedestal lessening the timeand expense involved in conventional tank construction wherein the tankand pedestal are completely assembled on-site and painted after completeassembly of the tank and pedestal.
 2. The method as in claim 1, whereinthe previously prepared place comprises a concrete foundation and saidtank is made and painted on the foundation and then set aside ontosuitable support means, said pedestal then being placed on and securedto the foundation.
 3. The method as in claim 2, wherein a prefabricatedand prepainted top section of the pedestal is temporarily secured to thefoudation and the tank is then made on top of the top section of thepedestal.
 4. The method as in claim 3, including forming the top sectionof the pedestal with an upwardly and outwardly flared section at the topthereof, fitting and welding of plates in a conical section of the tankto the upwardly and outwardly flared section, fitting and welding ofplates in a cylindrical section of the tank to the top of the conicalsection, fitting and welding of a roof to the top of the cylindricalsection, and cleaning and painting of the top section of the pedestal,the conical and cylindrical sections and the roof of the tank.
 5. Themethod as in claim 4, including making the pedestal in two sections, oneof said sections being set on and secured to the foundation, and theother of said pedestal sections then being set on and bolted to the topof the first section.
 6. The method as in claim 4, including removingthe tank from the support means and then setting the tank on top of thepedestal and bolting it thereto.
 7. The method as in claim 6, includingproviding each section of the pedestal with a corresponding length ofheader pipe and ladder therein, the header pipes and ladders in adjacentsections being in alignment with one another.
 8. The method as in claim7, including securing ends of the header pipes in adjacent pedestalsections together through a coupling allowing relative movementtherebetween to compensate for temperature changes and variations in thelength of the header pipe sections.
 9. The method as in claim 8,including making the tank in two substantially identical halves, andtemporarily securing the halves together along a temporary seam, andthen setting said tank aside onto the support means.
 10. The method asin claim 9, including setting the pedestal on the foundation andsecuring it thereto, breaking the temporary seam of the tank, andindividually setting each half of the tank onto the pedestal andsecuring it thereto, the halve then being permanently welded together atthe seam, and the seam being cleaned and painted.
 11. The method ofmaking and constructing a storage tank for liquids comprising the stepsof fabricating the various components of the tank in a shop facility,including rolling of column and cylinder tank plates, pressing of tankcone plates, rolling of stiffener rings, burning and drilling of variousflanges and base plates, and blast cleaning and painting of the variouscomponents; construction of a pedestal for the tank including fittingand welding together of the cylindrical plates, fitting and weldingtogether of the flanges and base plates thereon, fitting and welding ofaccessory items such as ladders, pipe headers, manholes, platforms andthe like thereon, and blast cleaning and Painting of said pedestal;constructing a top section of the pedestal, including fitting andwelding together of cylindrical plates, fitting and welding together offlanges, stiffener rings, and a dishplate, fitting and welding ofaccessory devices such as manholes, ladders and header pipes and thelike to said top section of pedestal, and blast cleaning and painting ofsaid top section of pedestal; shipping of the pedestal and top sectionof pedestal to an erection site for the storage tank; constructing atank on a previously constructed concrete foundation, including settingthe top section of pedestal on the foundation and temporarily boltingthe same thereto, fitting and welding of plates in a conical portion ofthe tank to the top of the top pedestal section, fitting and weldingplates in a cylindrical portion of the tank to the top of the conicalportion, fitting and welding a roof to the top of the cylindricalportion of the tank, and installing accessory items in the tank, andcleaning and painting the top section of the pedestal, the conical andcylindrical portions and the roof of the tank; removing the constructedtank from the foundation to supporting cribbing blocks nearby, settingthe pedestal on the foundation and securing same thereto by anchorbolts, lifting the tank from the supporting blocks and setting the sameon top of the pedestal and bolting same thereto, connecting the headerpipes in adjacent sections of pedestal and tank by means of a Dresserconnection to allow for temperature changes and to compensate forvariations in the length of header pipe sections, and filling the tankwith water and, if the tank is to be used for potable water, sterilizingthe tank.
 12. The method as in claim 11, wherein the pedestal is made intwo substantially identical sections, and including the steps of placinga first section on the foundation and securing it thereto and thenplacing the second section of the pedestal on top of the first sectionand bolting it thereto.
 13. The method as in claim 12, wherein the tankis made in two substantially identical halves and including the steps ofmaking said tank on the foundation and securing the two halves of thetank together along a temporary seam, painting said tank, removing saidtank from the foundation to supporting cribbing blocks nearby, placingand securing the pedestal on the foundation, breaking the temporary seambetween the halves of the tank, lifting each half of the tankindividually onto the top of the pedestal and securing each halfthereto, welding the halves of the tank together along said seam, andcleaning and painting said seam.